Tire-pump



F. HJORTH.

TIRE PUMP? APPLICATION man Juul?, 1920.

1,392,899., Y Patented oet. 4,1921.

w/mfssfs rter rice.

HJ'ORTH, OF HABLAN, IOWA.

TIRE-PUMP.

. application mea July 17,

To all .whom t may cof/wem .Be it known that I, linnn Haon'rrn'a subject of the King` of Denmark, and a resident ofHarlan, in the county of Shelby and State oiowa, 4have 'invented certain new and useful improvements in Tire-Pumps, ot which the` following is av specilication.

h/Iy invention relates generally to pumps and particularly, although not necessarily, to :hand operated tire pumps, a purpose of my invention being the provision of anair pump in which the intake and expulsion of air occurs .at each stroke of the piston where- `by, the pumping capacity ot a pump is doubled as compared to that of the ordinary pump. j Y

will describe `one form of tire pump embodying my invention and will then point out the novel features thereof in claim.

In the accompanying drawings:

Figure 1 is a view showing in vertical section and partly i-n elevation one form of pump embodying my invention.

Figs. 2 and3 areL transverse sectional views taken on the line 2 2 and 3-3, respectively.

Referring specifically to the drawings, in .which similar reference characters refer to similar parts, H designates generally a head casting,and B .a base casting which is connectedto the head casting by means of a cylinder desi',fz,'nated`` at C. llllorking within the cylinder C` isa piston designated generally at ,P which is adapted to be lactuated by ,a piston rod R.

As show-n in Fig. 1, .the hea-d casting H comprises a .body portion 15, the Vunder side of which is formed with a collar 1G which is interiorly threaded to threadedly engage the upper endf'ofthe cylinder C. The base castingB isV likewise provided with a collar 17 which threadedly engages'the lower end or the cylinder C. The body portion 15 is formedfwitfh an opening arranged axially o i* thecollar 1.6 and through which extends the piston rod R. Tlievwalls .of this opening threadedlw lreceive .a screw plug` 1S, such plug being bored to slidably receive the pis-V ton R. lVithin the lowerpart lof the opening of the body portion 15 is arranged wick packing for effecting a lubrication of the piston rod R, such packing being retained within the opening by the plug 18.

The head casting-'H is provided with lateral extensions 19 in which is formed a pocket 2O that is normally closed by a screw Specification of Letters Patent.

Patented Oct. d, 1921.

i920. sei-iai No. 396,962.

plug 21. The pocket 20 communicates with 4passages 22 and 23 formed within the extension 19, and at the junction o't the pocket and passages, valve seats 22a and 23a, respectively, are formed, upon either ot which a ball valve 24 is adapted to seat. That `portion of the pocket between the seats 22a and 23a is rounded, as indicated at 20a, so as to permit the valve 24 to roll from one seat to the other during the operation of the pump as will Abe more clearly described hereinafter. Also communicating with the pocket 20 is a discharge duct 25, the outer end of which communicates with a discharge nozzle 26 that is adapted to be connected to the flexible tube (not shown) as will vbe understood. y

The passage 22 etl'ects communication between the cylinder C and the pocket 20, while the passage 23 connects the pocket 20 with a pipe E arranged atV one side ot the cylinder C and connected to the head and base castings H and B by unions 27 and 27a, respectively. The unions in turn threadedly engage the walls ot' suitable sockets formed inthe castings, their outer end threadedly receiving cups 29 in which suitable packing is arranged.

The base casting` B is concaved on its upper side at a point corresponding to the lower end of the cylinder C as indicated at 30X Communicating with this concaved portion 30 is a duct 31 which extends vthrough the casting and into communication. with the union 27. By this arrangement it will be seen that the lower end o-t the pipe E is likewise in communication with the lower end of the cylinder C.

As shown in Figs. 1, 2 and 3. the `piston P comprises a disk shaped body 32'Y formed with a diametrically extending duct 3,2l which communicates at` a point medially of its ends with the interior ot' a collar 33 formed in the upper side of the body. T he vpiston rod R is of tubular formation as shown in Fig. 1, and its lower end is threaded'ly tted within the collar so as to communicate with the duct 32a. The collar 33 is also interiorly threaded to receive a lock nut 34 which is designed for the purpose of maintaining a leather cup washer 35 upon the body 32. interposed between the nut 34 and the washer 35 is a metal washer 36. The lower side ot the body 32 is formed with a circular projection 32b which is threaded to receive a nut 34a. The nut Malikewise maintains upon the body a leatherv cup washer 35a. and a metal washer 36a. Y Y

As previously stated, the piston rod R is of tubular formation, its outer or upper end being' provided with openings S7 for connectiiig the interior of the rod as well. as the duct 321 with the atmosphere. The upper extreme end of the piston rod is provided with a handle 3S which is adapted to be gripped in manuallyoperating the piston, as

willbe understood.

In operation, let it be assumed fthattlie piston P is at the upper end of the cylinder C with therod R in corresponding position. DuringVV downward movement of the piston', the valve 2-1 occupies the position shown in Fig. l so that the pocket 20 is outof communication with thev cylinder C, but is in communicationwith theV pipe E. It will thereforebe seen that as the piston descends the air' within the cylinderV and beneath the piston is expelled from the latter through the passage 3l, pipe E, passage 23, pocket V20,7d'uct 25 to discharge'nozzle 26. During this downward movement of the .piston,'aii is admitted to the cylinder C at a point above the piston P through the openings 3,7, rod R, and duct 32%. From the duct 32'L the air passes upwardly within the cylinder and past the cup washer 85, it vbeingunderstood that because of the flexible materialrof which the washer is formedya constriction'of the washer is effected to allow the escapenient of air between the washer and the wall of the cylinder. It will thus be seen that when the `piston P reaches the lowerend of the cylin- V der the latter is almost completely filled with valve 24e-will remain upon the seat 22a. Vvalve is further maintained in this position air', and as this air is not under pressure?, the The bythe .pressure of theair passing through the pocket 2O and outwardly through the nozzle 26.-

When the piston P moves upwardly from the bottom end of the cylinder, that body of air above'the piston is ejected `trom the cylinder through the passage 22, the air actin; to lift the valve 24 from theeseat 22a'rand depositing the same on the seat 23 so as to close the passage 23k and to thus disconnect such 'passage from the pocket 20. The

vSiriovenient o'f the valve 24k from Vthe, seat 22L tothe seat- 23a is facilitated by virtue of the rounded yportion 2O1 of the pocket. This eiilux of air vfrom the cylinder. continues side oi"- the piston andA theii'the' other, is' alsoY eli'ected.` Thus4V it will'be manifest thateach stroke .ofthe piston is a working stroke whereby tliecapacity of the pump is doubled as compared to pumps heretofore Vproposed".

Although l haveherein shown 'and described Vonly oneform of pump embodying my invention, itis tobe understood that various changes and inodiications may be made herein withoutfdeparting 'from the spirit of the invention andthe spirit and scope of the appended claim.

What l claim is:

A pump comprising'` a cylinder` ahead Y casting detachably lassociated with the upper Y end of the' cylinder, a pocket formed in the head casting, a` discharge-nozzle supported bythe headcasting and-"in communication with said pocket, a screw plug closing Vsaid pocket` a passage `forn'ied in theh'ea'd casting and effecting communication fbetween said pocket and the upper end of saidlcylinder, a second passage formed inthe head casting and communicating' with said pocket, 'a base casting` detachably associated with 'the lower end of said cylindei',`a passage yformed in the base casting,a pipe arranged'atone side of the cylinder, said pipe being detachably as# sociated with the base'andjhea'd'castings'and in communication'with the passage of the base castingand `the second ,passage of the head casting, valve seats ormed'in theV pas@` sag-es of the head casting, a roundedp'ortion 'Y arranged between `said seats, 'aball' Vvalve movable in said pocket and adapted toen, gage either of said seats, a piston movable within said cylinder, and a piston rod'. con- Vnected to said piston and extendingexte'- riorly of said cylinder, said pistonand'rod being formed to admit air to said Vcylinder Y at apointaboveV the' piston as 'the latter is descending and at 'a point below the piston as the samejis ascending." u Y t 

